From 6d7ccaff8777345dfc7387c36c575548f1e44658 Mon Sep 17 00:00:00 2001
From: David Thompson <dthompson2@worcester.edu>
Date: Thu, 1 Oct 2020 08:14:10 -0400
Subject: render: gpu: Lookup max texture size.

---
 chickadee/render/gl.scm  |  3 ++-
 chickadee/render/gpu.scm | 10 ++++++++++
 2 files changed, 12 insertions(+), 1 deletion(-)

diff --git a/chickadee/render/gl.scm b/chickadee/render/gl.scm
index 0781048..06c20e7 100644
--- a/chickadee/render/gl.scm
+++ b/chickadee/render/gl.scm
@@ -305,7 +305,8 @@ object.")
 ;;; Context Queries
 ;;;
 
-(re-export (%glGetString . gl-get-string))
+(re-export (%glGetString . gl-get-string)
+           (%glGetIntegerv . gl-get-integer-v))
 
 
 ;;;
diff --git a/chickadee/render/gpu.scm b/chickadee/render/gpu.scm
index e01486d..8921062 100644
--- a/chickadee/render/gpu.scm
+++ b/chickadee/render/gpu.scm
@@ -35,6 +35,7 @@
             gpu-gl-context
             gpu-gl-version
             gpu-glsl-version
+            gpu-max-texture-size
             gpu-blend-mode
             gpu-depth-test
             gpu-stencil-test
@@ -100,6 +101,7 @@ from the GPU's memory."
   (%make-gpu gl-context
              gl-version
              glsl-version
+             max-texture-size
              blend-mode
              depth-test
              stencil-test
@@ -113,6 +115,7 @@ from the GPU's memory."
   (gl-context gpu-gl-context)
   (gl-version gpu-gl-version)
   (glsl-version gpu-glsl-version)
+  (max-texture-size gpu-max-texture-size)
   (blend-mode %gpu-blend-mode)
   (depth-test %gpu-depth-test)
   (stencil-test %gpu-stencil-test)
@@ -125,6 +128,12 @@ from the GPU's memory."
 
 (define current-gpu (make-parameter #f))
 
+(define (max-texture-size)
+  (let ((bv (make-s32vector 1)))
+    (gl-get-integer-v (get-p-name max-texture-size)
+                      (bytevector->pointer bv))
+    (s32vector-ref bv 0)))
+
 (define (make-gpu gl-context)
   (define (extract-version attr)
     (car (string-split (pointer->string (gl-get-string attr)) #\space)))
@@ -152,6 +161,7 @@ from the GPU's memory."
     (%make-gpu gl-context
                gl-version
                glsl-version
+               (max-texture-size)
                (make-gpu-state (module-ref blend-module 'apply-blend-mode)
                                'replace)
                (make-gpu-state (module-ref depth-module 'apply-depth-test) #f)
-- 
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